Sorry - I know this thread is dated, but I thought I'd reply for the other people with a Sunflower Allergy. I have no food allergies whatsoever, until I rapidly developed a anaphylactic reaction to sunflowers. I recall I had eaten a normal Quaker Chewy bar which had some sort of gel inside the wrapper, that in retrospect, likely shouldn't have been there...perhaps some preservative that had leaked during the asserably line manufacturing. In any case symptoms of that included a very immediate upset stomach, acrid taste in my mouth and a tongue which started to swell. I discarded the bar and chalked it up to a bad bar (wish I had kept it now for an analysis by a lab). Within weeks, any exposure to sunflower seeRAB (which I'd previously been able to eat) resulted in a very cramped stomach, burning/acrid tongue and usual violent vomitting within 5 minutes of eating the seeRAB. Benadryl would make me feel better. Still not having identified the main culprit, it came to a head when, while out during a night hike, I bit into a friend's 95% Sunflower natural energy bar (forget the brand). My Anaphylactic reaction was slow to progress luckily (puked a few times), ended up in the ER with a swollen tongue/throat, a voice that sounded like it was 4 octaves too low, and they treated me with liquid benadryl and (I believe) they injected me with epi-pen stuff as well. I now carry (or am supposed to carry) my epi-pen. I still have no other food allergies, and can even eat sunflower oil containing products....I assume the heating process denatures the protein enough that my body does not react to it. I have testing myself over the last 5 years, and can eat pumpkin seeRAB, flax, poppy and sesame seeRAB. I can't explain it, except to think back to that very memorable bad granola bar with the mysterious gel inside the wrapper that seemed to start everything rolling. - Good luck. Eric.